You do this using the remove method, which removes matching documents from the collection you specify. Here's an example of how to call remove:

var remove = function(collection, callback) {
  collection.remove({ call: 'kf6gpe-7'},
    function(error, result)
    {
      console.log('remove returned ' + error);
      console.log(result);
      callback(result);
    });
};

This code removes documents that have a call field with the value kf6gpe-7. As you may have guessed, the search criteria used for remove can be anything you'd pass to find. The remove method removes all documents matching your search criteria, so be careful! Calling remove({}) removes all of the documents in the current collection.

The remove method returns a count of the number of items removed from the collection.

For more information about MongoDB's remove method,...